JP2576695Y2 - Electronic device mounting mechanism - Google Patents

Description

[Detailed description of the invention]

[0001]

[Industrial application field] The present invention relates to an electronic counter,
The present invention relates to a mechanism for mounting various electronic devices such as a timer and a temperature controller to a mounting target portion such as a mounting board, and more particularly to a mounting mechanism that facilitates attachment and detachment to and from a mounting target portion.

[0002]

2. Description of the Related Art In general, when such an electronic device is mounted on a mounting board, a method in which a screw insertion hole is formed in the mounting board and screws are fixed from the back surface is considered. In this case, there is a problem in that the mounting operation becomes complicated, and it is difficult to perform the removing operation in the event of a failure or replacement.

[0003] Further, a square hole corresponding to the outer shape of the casing is formed in the mounting board, and the casing is fitted into the square hole, and the casing is fixed by a screw-type fixing jig formed separately from the casing. May be fixed to a mounting board. However, a special tool is required for the work of forming a square hole in the mounting board, and the work is more difficult than the work of forming a round hole. Needless to say, a fixing jig is separately required for mounting on the mounting panel, which not only complicates the mounting structure on the mounting panel but also complicates the mounting operation.

Therefore, the applicant has provided a casing structure of an electronic device in which a conventional screw-type fixing jig is not required and the mounting operation is extremely simple (Japanese Patent Application No. 4-57575). The casing structure divides the main body of the electronic device into a front unit and a rear unit, engages both units with each other, and sandwiches the mounting board from both sides,
It is to be fixed to the mounting board.

[0005] By the way, in general, a system widely used as a mechanism for locking and unlocking two parts with each other is to fasten an engaging portion of both parts with a screw. There is a problem that operation is complicated.

As a lock mechanism with improved operability, there is known a combination of a lock lever biased in one direction with a spring and an engaged piece with which the lock lever is to be engaged. In such a conventional lock mechanism, the lock lever is formed to be long in the direction of engagement and disengagement of the two components in order to realize an operation of locking the lock mechanism in accordance with the engagement operation of the two components.

[0007]

[Problems to be Solved by the Invention] When a conventional general locking mechanism is provided in the casing structure of the above-mentioned electronic device according to the proposal of the applicant, the operation becomes complicated in the case of a screw-type locking mechanism, and the locking becomes difficult. In the case of the lever-type lock mechanism, there is a problem that the thickness of the casing increases according to the length of the lock lever.

It is an object of the present invention to provide a mounting mechanism which allows an electronic device to be easily mounted on and removed from a mounting board. Another object of the present invention is to increase the size of the device body including the front unit and the rear unit without increasing the size.
An object of the present invention is to provide an electronic device mounting mechanism capable of locking and unlocking two units with a simple operation.

[0009]

According to the present invention, there is provided a mechanism for mounting an electronic device on a casing of an electronic device, wherein a lock piece having a claw corresponding to a mounting target portion and a finger hook protruding outward from the casing are provided. The lock piece is urged in a direction in which the claw portion is engaged with the mounting target portion, and is interlocked with the movement of the operation piece in one direction. It slides in a direction to separate from the mounting target portion.

In the present invention, the electronic device is a front unit to be arranged along the front surface of the mounting board (13).
(11) and a rear unit (12) to be disposed along the back surface of the mounting board (13) are detachably engaged with each other. In this case, the casing (5) of the front unit (11)
A boss (52) to be fitted into the hole (14) opened in the mounting panel (13) protrudes from the back of the casing, and the casing of the rear unit (12)
At the front of (6), there is a boss accommodation chamber with which the boss (52) is to be engaged.
(61) is recessed. Further, a lock mechanism (7) for locking and unlocking the two units with each other is provided at an engagement portion between the front unit (11) and the rear unit (12). As the structure of the lock mechanism (7), the casing of the rear unit (12)
A lock piece (71) having a claw (72) projecting toward the boss (52) of the front unit (11) on the front surface of (6), and a finger hook ( Operation piece (7
3) are provided so as to be slidable toward and away from the boss (52), respectively. The lock piece (71) is fixed to the boss (5) by spring means interposed between the lock piece (71) and the casing (6) of the rear unit (12).
The operation piece (73) is urged in the direction approaching 2), and the boss (52)
The lock piece (71) is bossed in conjunction with the
It is connected to the lock piece (71) so as to move in a direction away from the (52). The boss (52) of the front unit (11) is provided with a notch (57) to be engaged with the claw (72) of the lock piece (71).

[0011]

When the electronic device is mounted on the mounting board, the mounting board is provided with an engaging hole corresponding to the claw of the lock piece, and the electronic device is mounted such that the claw engages with the engaging hole. At the time of removal, if the finger grip of the operation piece is operated, the lock piece slides in conjunction with this operation, and the claw part is detached from the engagement hole.

When the electronic device comprises a front unit and a rear unit, for example, a boss protruding rearward of the front unit is inserted into a hole of the mounting panel, and a boss (52) protruding from the back of the mounting panel (13) and the rear unit ( 12) Boss accommodation room (6
1) and engage.

[0013] With both units fully engaged,
The lock piece (71) moves in the direction approaching the boss (52) by the bias of the spring means, and the claw (72) fits into the cut groove (57) of the boss (52). As a result, both units are locked.

Thus, the mounting board (13) is sandwiched between the front unit (11) and the rear unit (12), and the electronic device in which both units are engaged is fixed to the mounting board (13). Become.

To release the lock, the finger hook (76) of the operation piece (73) is pressed to move the operation piece (73) toward the boss (52) of the front unit (11). The lock piece (7
1) moves in a direction away from the boss (52) against the spring means, and the claw (72) is separated from the cut groove (57) of the boss (52). In this state, if the front unit (11) and the rear unit (12) are separated, both units will be disassembled.

[0016]

[Effect of the Invention] In the electronic device mounting mechanism according to the present invention, the lock piece (71) and the operation piece constituting the lock mechanism are provided.
Since (73) is arranged in a direction perpendicular to the engagement and disengagement directions of the two units, the provision of the lock mechanism does not increase the size of the electronic device. Further, the lock can be released by a very simple operation of merely pressing the operation piece (73).

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is applied to an electronic counter will be described in detail with reference to the drawings. Electronic counter (1)
1 includes a front unit (11) and a rear unit (12) as shown in FIG. 1. The front unit (11) is provided with a digital display section (41) and operation keys (42).

On the back of the front unit (11), as shown in FIG. 2, a boss (52) composed of a cylindrical first cylindrical portion (53) and a rectangular cylindrical second cylindrical portion (54) is provided. On the front surface of the rear unit (12), a first cylindrical portion to which the boss (52) is fitted as shown in FIG.
The boss accommodation chamber (61) including the (62) and the second cylindrical portion (63) is recessed.

As shown in FIG. 3, a front unit (11) and a rear unit (12) are arranged on both sides of a mounting board (13), and the two units (11) and (12) are engaged with each other to form an integral unit. An electronic counter (1) is configured.

The front unit (11) is as shown in FIG.
A casing with an open front and a boss (52) protruding from the back
A first circuit board on which a digital display control circuit is mounted in an opening of the casing; and a second circuit board on which a CPU is mounted inside the casing. (16) is accommodated.

In the upper half of the surface of the first circuit board (15), L
The ED panel (4) is attached. LED panel (4)
Has a multi-digit digital display section (41), and a thin-walled flange section (43) is formed in the upper part and the left and right peripheral parts.

As shown in FIG. 10, a plurality of tact switches (42) for setting a count value and the like are arranged in the lower half of the surface of the first circuit board (15). In addition, tact switch (42)
Has substantially the same height as the LED panel (4). or,
In the lower half of the surface of the circuit board (15), a spacer (45) having the same thickness as the LED panel (4) is installed. The spacer (45)
A hole (46) for exposing each tact switch (42) is opened, and a thin flange portion (47) similar to the LED panel (4) is formed in a peripheral portion.

Therefore, the spacer (4) is provided on the first circuit board (15).
In the state where 5) is installed, the surface of the LED panel (4) and the surface of the spacer (45) are flush with each other as shown in FIG.
The flange portion (43) of the ED panel (4) and the flange portion (47) of the spacer (45) are continuous.

On the surface of the LED panel (4) and the spacer (45), a urethane protective sheet (3) for drip-proof and dust-proof.
Is covered. The protective sheet (3) has an LED around its periphery.
An eaves portion (31) overlapping the flange portions (43) and (47) of the panel (4) and the spacer (45) is formed in a dish shape as a whole.
The protective sheet (3) can be embossed according to the shape of the pressing operation portion of the tact switch (42) slightly projecting from the surface of the spacer (45).

The front unit (11) further includes a casing
A frame (2) to be engaged with (5) is provided. The frame (2) is formed with a window (22) for exposing the LED panel (4) and the tact switch (42) on the first circuit board (15), and the eaves of the protective sheet (3). Flange according to the shape of (31) (21)
Are formed.

The casing (5) is provided with a plurality of elastic hooks (59) protruding from a plurality of locations around the casing. On the inner surface of the frame (2), a plurality of elastic hooks (59) are to be engaged. Engagement receiving piece
(23) is formed. Therefore, the first circuit board (15) including the LED panel (4), the spacer (45), and the protection sheet
By engaging the casing (5) and the frame (2) with (3) interposed therebetween, the front unit (11) is assembled as shown in FIG.

An annular packing (8) is fitted into an engagement portion between the outer peripheral surface of the casing (5) and the inner peripheral surface of the frame (2).

In the front unit (11), the eaves (31) of the protective sheet (3) are connected to the LED panel inside the frame (2).
(4) and the flanges (21) and (47) of the spacer (45) and the frame
Because it is sandwiched by the flange portion (21) of (2),
The protective sheet (3) does not come off.

Here, since the protective sheet (3) is substantially flush with the front surface of the flange portion (21) of the frame (2), the surface of the protective sheet (3) can be easily cleaned to every corner. It is possible to Also, protective sheet (3) and LED panel
Since the contact area between (4) and the spacer (45) is large, when the protective sheet (3) is adhered, it can be securely fixed.

The front unit as shown in FIGS. 2 and 4
The first tubular portion (53) of the boss (52) of (11) is provided with a pair of upper and lower cutting grooves (57) (57) which constitute a locking mechanism described later. Further, a protruding piece (58) for preventing rotation is formed on the outer peripheral surface of the first cylindrical portion (53). Correspondingly, an engagement receiving portion (not shown) with which the projecting piece (58) is to be engaged is recessed in the round hole of the mounting board.

As shown in FIGS. 2 and 7, a pair of left and right elastic arms (55) and (55) are provided on the second cylindrical portion (54) so as to project toward the rear side of the main body (51). At the tip of the elastic arm (55), a stepped portion (56) composed of a plurality of steps is engraved outward.

The third cylindrical portion (53) and the second cylindrical portion (54) have a third
A circuit board (17) is installed, and on the third circuit board (17),
A female connector (50) for electrical connection with the rear unit (12) is provided in the opening on the second cylinder (54) side.

On the other hand, the casing (6) of the rear unit (12)
Inside the boss housing chamber (61), a fourth circuit board (18) on which a power supply circuit is mounted is installed, as shown in FIG.
On the circuit board (18), a male connector (60) to be engaged with the female connector (50) is provided.

A fourth circuit board is provided in the casing (6).
Further behind the (18), a fifth circuit board (19) is installed, and the fifth circuit board (19) is connected to a plurality of terminals (65) provided on the back of the casing (6). These terminals (65) are connected to a commercial power supply or an external device.

On the front surface of the casing (6), a lock mechanism (7) is provided so as to surround the boss accommodating chamber (61) as shown in FIG. The lock mechanism (7) includes a pair of lock pieces (71) and (71) that are slidable up and down across the boss storage chamber (61), and slides left and right across the boss storage chamber (61). It is provided integrally with a pair of operation pieces (73) (73) that are arranged so as to be possible.

As shown in FIG. 8, a claw portion (72) to be fitted into a cut groove (57) formed in the first cylindrical portion (53) of the front unit (11) is provided at the tip of each lock piece (71). ) Is formed. The claw (72) is formed with a slope that is inclined low toward the boss storage chamber (61). Each lock piece (71) is compressed by a compression spring (75) interposed between the casing (6) and the boss housing chamber (61).
Biased to the side.

The operation piece (73) has a finger hook (76) projecting outward from the casing (6) of the rear unit (12).

The pair of upper and lower lock pieces (71) and (71) and the pair of left and right operation pieces (73) and (73) surround the boss housing chamber (61) and are connected to each other by a connecting arm (74). In addition, a notch (77) is formed in each connecting portion to facilitate bending at the connecting portion.

The lock piece (71) and the operation piece (73) are respectively composed of a plurality of protrusions (78) and (79) formed on the casing (6) of the rear unit (12). (67), and in this state, the lock piece (71) is vertically
3) is slidable left and right. For example, the operation piece (73) (7
As the 3) moves toward the boss storage chamber (61), the lock pieces (71) and (71) are pressed by the connecting arm (74) and move in a direction away from the boss storage chamber (61). Become.

Accordingly, as shown in FIG. 1, a pair of operating pieces (73) (73)
In a state where the hand is released, the pair of lock pieces (71) and (71) are urged by the spring (75) and move to the boss housing chamber (61) side, and the claw (72) is moved to the boss housing chamber ( 61) Enter inside. Along with this, the pair of operation pieces (73) and (73) move in a direction away from each other, and their finger hooks (76) protrude from the side surface of the casing (6).

When the finger hooks (76) and (76) of the pair of operation pieces (73) and (73) are pressed from both sides to move the operation pieces (73) and (73) toward the boss housing chamber (61), When pressed by the four connecting arms (74), the pair of lock pieces (71) (71) move in the direction away from the boss housing chamber (61) against the spring (75), and 7
2) will leave the boss accommodation room (61).

As shown in FIG. 6, during the process of engaging the front unit (11) with the rear unit (12), the pair of lock pieces (71) (71) of the lock mechanism (7) are Claw part (72)
Are pressed by the first tubular portion (53) of the front unit (11), and are pushed and opened in directions away from each other by a cam action. After that, the front unit (11) becomes the rear unit (12)
At the same time, the pair of lock pieces (71) (71)
The spring is biased to move toward the first cylindrical portion (53), and the claw portion (7
2) fits into the cut groove (57).

As a result, the front unit (11) and the rear unit (12) are locked to each other. At this time, the female connector (50) of the front unit (11) and the male connector (60) of the rear unit (12) are engaged, and the third circuit board (17) and the fourth circuit board (18) are connected. Electrical connection is made.

To release the lock, the pair of operation pieces (73) and (73) are pressed from both sides as described above. As a result, the claw portion (72) of the lock piece (71) is connected to the cut groove (57) of the first cylindrical portion (53).
Will get out of the way.

When the electronic counter (1) is mounted on the mounting board (13) as shown in FIG. 7, a pair of elastic arms (55) (55)
Is pressed inward by the opening edge of the mounting board (13),
Although it is elastically deformed, it is elastically restored when the engagement is completed, and the stepped portion (56) engages with the opening edge of the mounting board (13). As a result, the electronic counter (1) is securely fixed to the mounting board (13).

Here, even if there is some variation in the thickness of the mounting plate (13), the stepped portion (56) and the opening edge of the mounting plate (13) are formed by the elasticity of the elastic arms (55) and (55). As the engagement position is shifted, the variation is absorbed, and a reliable mounting state is always obtained regardless of the thickness of the mounting board (13).

The electronic counter (1) is a mounting board as shown in FIG.
When attached to (13), the front unit (11)
The packing (8) provided on the mounting plate (13) comes into close contact with the front surface of the mounting board (13), thereby forming a drip-proof structure.

In the electronic counter (1), a round hole is formed in the mounting board (13), and if necessary,
Since it is sufficient to perform a simple additional process for preventing rotation, a simple operation using a general tool such as a drill is sufficient.

When mounting on the mounting board (13),
It is only necessary to engage the front unit (11) and the rear unit (12) arranged with the (13) interposed therebetween, and the operation is completed with one touch. At this time, no special fixing jig is required.

Since the second circuit board (16) mounted with the CPU is arranged in the front unit (11), the female connector () for electrically connecting the front unit (11) and the rear unit (12) is provided. It is possible to reduce the pin count of the 50) and the male connector (60) as much as possible.

Further, in the structure of the front unit (11), even when a plurality of models having different positions and numbers of the tact switches (42) are manufactured, if only the spacer (45) is manufactured for each model, the frame body can be manufactured. For (2), a common shape can be used.

In this case, it is necessary to produce a plurality of types of spacers (45) having different positions and numbers of holes (46), but this is relatively easy and does not greatly affect the production cost. Rather, by standardizing the frame (2), a mold having a complicated shape for producing the frame (2) can be commonly used,
As a result, manufacturing costs can be reduced.

The description of the above embodiment is for the purpose of explaining the present invention, and should not be construed as limiting the invention described in the claims for utility model registration or reducing the scope. Further, the configuration of each part of the present invention is not limited to the above-described embodiment, and it is needless to say that various modifications can be made within the technical scope described in the claims for utility model registration.

For example, when the lock piece and the operation piece are integrally formed as in the above embodiment, it is possible to adopt a structure in which the operation piece is spring-biased in a direction away from the boss.
When the lock piece is biased by a spring, the lock piece and the operation piece can be formed separately. In this case, it is possible to adopt a separation structure in which the front ends of two openable and closable connecting arms (74) (74) protruding bifurcated from each operation piece (73) are locked to the side wall of the lock piece (71).

Further, in the above-described embodiment, the mounting target portion is formed by recessing the notch (57) in the boss (52) of the front unit (11). However, the present invention is not limited to this. A structure in which the tip of the lock piece is engaged with the engagement hole established in
It is also possible to adopt a structure in which a mounting target portion is formed using a so-called DIN rail fixed to a mounting board.

[Brief description of the drawings]

FIG. 1 is a perspective view of an electronic counter according to the present invention in a state where a front unit and a rear unit are disassembled.

FIG. 2 is a perspective view of the front unit as viewed from the back.

FIG. 3 is a side view of an electronic counter fixed to a mounting board.

FIG. 4 is a vertical sectional view of a front unit.

FIG. 5 is a vertical sectional view of a rear unit.

FIG. 6 is a vertical sectional view showing a state where a front unit and a rear unit are engaged.

FIG. 7 is a horizontal sectional view of the same.

FIG. 8 is an exploded perspective view showing the configuration of a lock piece and an operation piece constituting a lock mechanism.

FIG. 9 is an exploded perspective view of the front unit.

FIG. 10 is an exploded perspective view showing a state where a spacer is removed from the first circuit board.

[Explanation of symbols]

 (11) Front unit (12) Rear unit (13) Mounting board (14) Round hole (2) Frame (21) Flange (22) Opening (3) Protective sheet (4) LED panel (45) Spacer (5) ) Casing (52) Boss (57) Groove (6) Casing (61) Boss accommodation chamber (7) Lock mechanism (71) Lock piece (72) Claw (73) Operation piece (74) Connecting arm (76) Finger Hanging (75) Spring

Claims (2)

(57) [Scope of request for utility model registration] 1. A mechanism for mounting an electronic device on a mounting target portion, wherein a casing of the electronic device has a lock piece having a claw corresponding to the mounting target portion, and a finger hook protruding outward from the casing. The operation piece is slidably provided, and the lock piece is urged in a direction in which the claw portion engages with the attachment target portion, and the lock piece is attached to the attachment piece in conjunction with the movement of the operation piece in one direction. A mounting mechanism for an electronic device, wherein the mounting mechanism slides in a direction of detaching from a part. 2. An electronic apparatus comprising a front unit (11) and a rear unit (12) to be disposed on both sides of a mounting board (13), which are detachably engaged with each other. At the back of the casing (5) of (11), a boss (52) to be fitted into the hole (14) opened in the mounting board (13) is projected, and the front of the casing (6) of the rear unit (12) is provided. The boss accommodating chamber (61) with which the boss (52) is to be engaged is recessed, and the front unit (11) and the rear unit (12) are locked and unlocked in the engaged state with each other. Unit (1
A lock piece (7) having a claw (72) projecting toward the boss (52) of the front unit (11) is provided on the front surface of the casing (6) of (2).
1) and an operation piece (73) having a finger hook (76) protruding outward from the rear unit (12) are provided so as to be slidable toward and away from the boss (52), respectively, and a lock piece ( 71) is urged in a direction approaching the boss (52) by a spring means interposed between the operating piece (73) and the casing (6) of the rear unit (12).
Is linked to the lock piece (71) so that the lock piece (71) moves in the direction away from the boss (52) in conjunction with the movement in the direction approaching the boss (52), and the front unit (11) The mounting mechanism for an electronic device, characterized in that the boss (52) has a notch (57) with which the claw (72) of the lock piece (71) is to be engaged.